Was Richard M. Aoki, an icon of the 1960s protest movement in
the Bay Area, an informant for the Federal Bureau of
Investigation?

That's the explosive claim made by Seth Rosenfeld, a journalist
who has just published Subversives: The FBI's War on Student
Radicals, and Reagan's Rise to Power (Farrar, Straus and
Giroux), the product of 31 years of research.